/*
 * Copyright 2020 The Kubernetes Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/** Is the given `elm` on visible in the current viewport? */
export default function isInViewport(elm: HTMLElement) {
  const rect = elm.getBoundingClientRect()
  const viewHeight = Math.max(document.documentElement.clientHeight, window.innerHeight)
  return !(rect.bottom < 0 || rect.top - viewHeight >= 0)
}
